When you are comparing quotes you need sufficient detail to ensure that what you are comparing is similar in nature. If you are not careful, what seems like a good price could merely turn out to be a lower specification.
It is the same with labour. Make sure that you are getting a price that takes into account your timescales for completion.

We want excellent feedback from you and so once you have sent back the acceptance letter we will give you a start date and a work plan showing things such as who will be on site and when. This will include a delivery schedule when required. You will have regular opportunities to comment on the work in progress. If you are not on site we will send you photographs. If you require polices to meet your site management requirements, we will provide them.